JPS5922265A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To attenuate the mechanical resonance of a servo system, to improve the positioning accuracy of a magnetic head and to attain high speed positioning, by using a magnet consisting a voice coil motor as a dumping mass. CONSTITUTION:A voice coil 8 constituting the voice coil motor is fitted to one end of a carriage 15, the voice coil motor receives force by electromagnetic induction between the magnet 7 and the motor under current control by the voice coil 8 and turns arounds a pivot shaft 6 to position a data head group 3 on a prescribed position. A carriage block 9 surrounds the magnet 7 and dumpers 20, 21, 22, 23 are fitted to the edges of the magnet 7. The magnet 7 is fitted to the lower surface of the case of the carriage block 9 by a spring 27, a spacer 26 and a screw 25 so as to be slightly oscillated, but restricted by the dumpers 20, 21, 22, 23. Consequently, mechanical resonance of the servo system which is generated by one or plural elements constituting the mechanical oscillation transmitting system of the servo system can be attenuated by the friction attenuating effect by the magnet 7 and the carriage block 9.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention The present invention relates to a magnetic disk device that positions a magnetic head using servo control at a predetermined track position on a disk surface.

BACKGROUND ART Conventionally, as a vibration-proofing measure for an actuator that positions a member to be positioned at a predetermined position by servo control, measures have been devised for the purpose of improving the rigidity of the structure or damping the imaging using a damper. To explain the prior art with drawings, it is a drive source for a rotary actuator shown in FIGS. 1 and 2 (FIG. 2 is a sectional view taken along the dashed line in FIG. 1).
The magnet 7 of the voice coil motor that utilizes electromagnetic induction is supported by being sandwiched between two magnet supports 19 via a long bolt 24, and the arrow 17 during acceleration and deceleration is supported.
Although some products are intended to improve the rigidity of the actuator against rotational moment in the direction, the number of parts and the number of fastening points increases. The disadvantage was that it required high accuracy and was expensive. Also, a bearing 13 that supports the pivot shaft 6, which is the center of rotation of the head arm, a carriage block 9 that fixes the ta,
The vibration of the carriage block 9 was damped by solid friction between it and the damping pad 28 on the carriage block 9. However, the increase in weight due to the damping mass 2B and the weight restriction of the damping mass caused design problems.

Object of the Invention The object of the present invention is to improve positioning accuracy as the storage capacity of a magnetic disk storage device increases, that is, to narrow the track pitch, and to enable high-speed positioning as the speed of information transfer with the computer main body increases. The goal is to provide a mechanism.

Embodiment of the Invention In a movable head type disk storage device, the movable head moves in the radial direction of the rotating storage disk as soon as a request is made to recall specific information on the rotating storage disk. Must change position quickly. Therefore, a relatively high output voice coil motor is used to drive the head to displace and position the movable head, but the positioning of the movable head must be accurate and highly accurate. .

However, when the voice coil motor fixed on the pace performs a rapid operation due to a command such as a call, it vibrates due to the impact caused by the rapid acceleration/deceleration control, and a bending moment is generated against the base. This causes off-track. In the past, even if this amount of off-track was large, the storage density of the rotating storage disk was small and there was sufficient margin for information recall and writing, but with the increase in capacity in recent years,
As the recording density increases, the margin when reading and writing information decreases, and anti-vibration measures are required to reduce the amount of off-track.

An embodiment of the present invention will be described below with reference to the drawings. 3, 4, and 5 show an embodiment of the present invention. Fourth
The figure is a sectional view corresponding to FIG. 2. A carriage 15 holds a data arm group 4 that supports a plurality of data heads 6 for writing and reading information. On the other hand, a voice coil 8 forming a voice coil motor is installed at the other end of the carriage 15, and by controlling the current of the voice coil 8, it receives force due to electromagnetic induction with the magnet 7, and rotates around the pivot shaft 6. and position the data head group 3 at a predetermined position. The pivot shaft 6 has a pair of upper and lower bearings 1.
3.14, and the bearing 1
3.14 is firmly fixed to the carriage block 15 by a method such as press fitting. Further, the carriage block 9 is screwed into a base 16 that holds a spindle (not shown) for fixing and rotating the magnetic disk 1 (screw holes are 10).
Fixed. Further, the carriage block 9 has a dovetail shape as shown in FIG. 4, and has a structure surrounding the magnet 7, and has dampers 20 and 21 at its edges, respectively.

22 and 23 are attached. The magnet 7 has a spring 27 on the bottom surface of the carriage block 90 box. Spacer 26.
The screw 25 allows slight movement on the lower surface of the assembly, creating a hollow structure. Of course, the magnet 7 is the damper 20.21.22.
, 26, so it does not move much. Therefore, the servo system mechanical resonance generated by one or more elements constituting the mechanical vibration transmission system of the servo system is damped by the frictional damping effect of the magnet 7 and the carriage block 9, and the servo system is stably maintained. can do.

Effects of the Invention According to the present invention, since the magnet 7 constituting the voice coil motor acts as a damping mass, the servo system mechanical resonance generated by one or more elements constituting the servo system mechanical vibration transmission system is suppressed. It is possible to attenuate the servo system and maintain stability.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional positioning device, FIG. 2 is a vertical sectional view of the conventional positioning device shown in FIG. 1, FIG. 6 is a perspective view showing an embodiment of the present invention, and FIG. FIG. 6 is a vertical sectional view showing the Q embodiment of the present invention shown in FIG. 6, and FIG. 5 is a plan view showing the embodiment of the present invention shown in FIG. 3. Explanation of symbols 1... Magnetic disk, 2... Servo head, 3... Data head, 4... Rad arm to data, 5... servo head arm,
6... Pivot shaft, 7... Magnet, 8... Voice coil, 9... Carriage block, 10... Fixing hole, 11...・
...Screw, 12...Screw, 16...Bearing (top), 14...Bearing (bottom), 15
... Carriage, 16 ... Base, 17
...Arrow, 1st day...Screw, 19...
Magnetic support, 20...Tampa. 21...Damper, 22...Damper, 23.
...Damper, 24...Long bolt, 25...
...Screw, 26...Spacer, 27...
Spring, 28... Damping mass, 29...
screw. % 1 figure

Claims (1)

[Claims] A magnetic disk device that positions a magnetic head at a predetermined track position on a disk surface by servo control includes a carriage that holds the magnetic head, a voice coil motor that drives the carriage, and a carriage flock that holds the carriage. A magnetic disk drive characterized in that the voice coil motor has a magnet, and the magnet is movably held by the carriage block.